Navigation position plotter

Abstract

A navigation position plotter for determining the navigation coordinates of a point on a navigation chart and plotting the position of a point on the navigation chart. A plate bearing navigation scales divided into increments between two spaced grid lines on the navigation chart is mounted on a frame. A first plotting bar is movably mounted on the frame. A second plotting bar is pivotally mounted on the frame and intersects the first plotting bar. The frame is position over the chart such that the navigation coordinate increment underlying the second plotting bar can be read after the first and second plotting bars have been moved into intersecting relationship over the point to be plotted.

What is claimed is: 
     
       1. A navigation position plotter for use with a navigation chart bearing spaced navigation grid lines comprising: a frame;   a plate mounted on the frame;   a scale formed on the plate having designations corresponding to incremental graduations between two adjacent grid lines on a navigation chart;   a first plotting bar slidingly mounted on the frame for movement across the frame; a first plot line formed on the first plotting bar;   a second plotting bar pivotally mounted on the frame at one end and movably intersecting the first plotting bar;   a second plot line formed on the second plotting bar a portion of the second plot line overlying the navigation scale on the plate; and   means, carried by the frame, for positioning the frame over a navigation chart with respect to the position to be plotted such that the scale increments of the position to be plotted between two adjacent grid lines on the navigation chart underlie the second grid line when the first and second plot lines are disposed in intersecting relationship over the point to be plotted.   
     
     
       2. The navigation position plotter of claim 1 wherein the positioning means comprises: means for aligning the frame over a grid line on the navigation chart adjacent to the point to be plotted; and   a first scale indicia line formed on the plate and disposed at a predetermined angle with respect to the first plot line;   the first scale indicia line cooperating with the aligning means and the first plot line to establish the position of the first plot line on the frame with respect to the spacing between two grid lines on the chart adjacent to the position to be plotted.   
     
     
       3. The navigation position plotter of claim 1 wherein the scale is divided into at least one of longitude and latitude degree minute and degree second increments. 
     
     
       4. The navigation position plotter of claim 1 wherein the scale is divided into Loran time delay interval increments. 
     
     
       5. The navigation position plotter of claim 1 wherein the scale includes a plurality of scales respectively divided for longitude and latitude minutes and seconds, and Loran time delay interval increments. 
     
     
       6. The navigation position plotter of claim 2 wherein the aligning means includes: a member movably mounted on the frame and disposed substantially perpendicular to the first plotting bar; and   a base line formed on the movable member and adapted to be movably disposed over a grid line on the navigation chart adjacent to the position to be plotted.   
     
     
       7. The navigation position plotter of claim 2 wherein the aligning means includes: first and second members, each bearing a base line; movably mounted on the frame for movement substantially perpendicular to the first plotting bar;   means for movably interconnecting the first and second members for simultaneous parallel movement; and   first and second scales indicia lines formed on the plate and disposed at a predetermined angle apart.   
     
     
       8. The navigation position plotter of claim 7 wherein the means for movably interconnecting first and second members includes; pulley means mounted on the frame; and   a cable movably engaging the pulley means and connected to opposed ends of the first and second movable members for maintaining the first and second members substantially parallel and for moving the first and second member equally toward and away from each other.   
     
     
       9. The navigation position plotter of claim 1 further including first means for moving the first plotting bar, the first moving means comprising: a slider slidingly mounted on the frame; and   connecting means secured to the slider at one end and carrying at the other end one end of the first plotting bar;   pulley means mounted on the frame; and   a cable movably engaging the pulley means and connected to opposite ends of the first plotting bar such that movement of the slider causes equal movement of both ends of the first plotting bar.   
     
     
       10. The navigation position plotter of claim 9 further including second means for moving the plotting bar, the second moving means comprising: a second slider slidingly mounted on the frame; and a second connecting means secured to the second slider at one end carrying at the other end one end of the second plotting bar such that movement of the second slider causes corresponding movement of the second plotting bar.   
     
     
       11. The navigation position plotter of claim 1 wherein the aligning means comprises a base line indicia formed on the plate and extending perpendicular to the first plotting bar. 
     
     
       12. A navigation position plotter for use with a navigation chart bearing spaced navigation grid lines comprising: a frame;   a plate mounted on the frame;   a plurality of scales formed on the plate having designations corresponding to incremental longitude and latitude degree minutes and degree seconds and Loran time delay interval between two adjacent grid lines on a navigation chart;   a base line indicia formed on the plate end extending thereacross;   first and second scale line indicia formed on the plate and disposed at a predetermined angle on opposite sides of the base line indicia;   a first plotting bar slidingly mounted on the frame for movement across the frame;   a first plot line formed on the first plotting bar;   first means for moving the first plotting bar, the first moving means comprising:   a first slider slidingly mounted on the frame; and   a first connecting means secured to the slider at one end and carrying at the other end one end of the first plotting bar; and   pulley means mounted on the frame; and   a first cable movably engaging the pulley means and connected to opposite ends of the first plotting bar such that movement of the first slider causes equal movement of both ends of the first plotting bar;   a second plotting bar pivotally mounted on the frame at one end and movably intersecting the first plotting bar;   a second plot line formed on the second plotting bar, a portion of the second plotline overlying the scales on the plate;   second means for moving the plotting bar, the second moving means comprising:   a second slider slidingly mounted on the frame; and   second connecting means secured to the second slider at one end and carrying at the other end one end of the second plotting bar such that movement of the second slider causes corresponding movement of the second plotting bar;   a first member and a second member, each bearing a base line indicia movably mounted on the frame for movement substantially perpendicular to the first plotting bar;   means for movably interconnecting the first and second members including:   pulley means mounted on the frame; and   a cable movably engaging the pulley means and connected to opposed ends of the first and second movable members for maintaining the first and second members substantially parallel and for moving the first and second members equally toward and away from each other;   the first and second scale indicia, the first and second members and the first plotting line cooperating to position the frame over a navigation chart with respect to the position to be plotted such that the scale increments of the position to be plotted between two adjacent grid lines on the navigation chart underlie the second plot line when the first and second plot lines are disposed in intersecting relationship over the point to be plotted.